用于橄榄油产品质量原位监测和评价的光纤探针的微调和克隆

D. Pérez-Marín, J. A. Adame-Siles, F. Sánchez-Müller, F. Maroto-Molina, A. Garrido-Varo
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引用次数: 1

摘要

作者总结:散装橄榄油在卸货前的符合性控制是包装厂满足质量标准和确保可追溯性的重要步骤。需要不同于现场抽样和分析的新方法来提高效率和决策过程。近红外光谱(NIRS)提供快速,经济高效的原位分析测量,无需样品制备,这使其成为实现这一目标的理想技术。这项工作的目的是评估和优化光纤探头的光谱采集,特别是设计用于采样和分析油罐车。该探头具有两束光纤,一束用于测量,一束用于照明。首先,用特级初榨橄榄油和lampante橄榄油两种样品,对目标探针的近红外光谱信号的噪声和可重复性进行了评价。每个样品记录了一组20个光谱,并且每天重复三次测量lampante-特级初榨的序列,为期7天,共5周。使用一阶导数预处理评估噪声水平,最佳工作范围(去除噪声区域后)为1150-2149 nm。结果表明,lanpante的RMS (Mean)值高于特级初榨橄榄油(分别为12630 μlog(1/R)和2998 μlog(1/R))。此外,还进行了标准化程序,与实验室探针进行比较研究。两个探针连接到一个矩阵- f傅里叶变换近红外仪器。一组42个不同性质的样本用于标准化目的。建立2个标准化矩阵,分别选择1个(STD1)和10个(STD2)样品,使用32个样品的验证集。通过计算RMS(c)统计量,利用验证集对光谱调整进行评估。标准化前主探针(实验室探针,LP)与卫星探针(原位分析探针,IAP)获得的RMS(c)值显示出重要差异,并通过最佳标准化矩阵(STD1)显着纠正。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fine-tuning and cloning of a fiber-optic probe for in situ monitoring and evaluation of quality of olive oil products
Author Summary: The control of conformity at reception of bulk olive oil before unloading is an essential step for packing plants to meet quality standards and ensure traceability. New approaches, different to sampling and analysis at-line, are needed to improve efficiency and decision-making processes. Near-infrared spectroscopy (NIRS) provides fast, cost-effective and in situ analytical measurements without sample preparation, which makes it an ideal technology towards this goal. The purpose of this work is to assess and optimize the spectral acquisition with a fiber-optic probe, especially designed to sample and analyze tank trucks. This probe features two fiber optic bundles, one of measurement and one of illumination. First of all, two olive oils samples, one of extra virgin and one of lampante category, were used to evaluate the noise and repeatability of the NIRS spectral signals of the target probe. A set of 20 spectra were recorded for each sample, and the sequence of measurements lampante-extra virgin was repeated three times per day for seven days spread over five weeks. The noise level was evaluated using a first derivative pre-treatment, and the optimum working range (after removing the noisy regions) was 1150–2149 nm. The Root Mean Square (RMS) statistic and the MEAN values were calculated in each case, and the spectral repeatability results showed that the RMS (MEAN) values for lampante were higher than for extra virgin olive oil (12,630 and 2998 μlog(1/R), respectively). Furthermore, a standardization procedure was performed to make a comparative study with a laboratory probe. Both probes were connected to a MATRIX-F Fourier transform-NIR instrument. A set of 42 samples of different nature were used for standardization purposes. Two matrices of standardization were developed, selecting 1 (STD1) and 10 (STD2) samples, and a validation set of 32 samples was used. The spectral adjustment was evaluated using the validation set by calculating the RMS(c) statistic. The RMS(c) values obtained in the master (laboratory probe, LP) versus satellite (in situ analysis probe, IAP) before standardization showed important differences that were significantly corrected by the best standardization matrix (STD1).
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